Lennox 28G45 Limit switch
The Lennox 28G45 Limit Switch is a critical safety component designed for precise thermal regulation within residential and commercial Lennox HVAC systems. Engineered for automatic reset functionality, this high-limit control monitors plenum temperatures, interrupting the burner circuit if conditions exceed the preset safety threshold of 140Ā°F. This OEM Lennox furnace part features a versatile 60Ā°F to 140Ā°F operating range, ensuring stable performance during demanding heating cycles. Its durable ceramic and metal construction is built to withstand the high-heat environment of a heat exchanger while maintaining electrical continuity. For service technicians, identifying a failing 28G45 thermal switch often involves checking for frequent cycling or a furnace that stays in lockout mode. Replacing a worn Lennox high limit sensor with this genuine factory component ensures UL-certified protection and maintains the integrity of the furnaceās sequence of operations, preventing heat exchanger stress and potential safety hazards on the job site.
Key Technical Benefits
- Precise Thermal Calibration: Factory-set for 60-140Ā°F range to prevent overheating in Lennox G24 and G26 series units.
- Automatic Reset Logic: Eliminates the need for manual intervention once the temperature drops below the differential, reducing nuisance service calls.
- OEM Compatibility: Drops directly into standard Lennox limit switch mounting brackets for fast field installation.
- Robust Electrical Contacts: Designed to handle standard furnace control voltages without carbon tracking or premature failure.
Common Questions
How do I verify if the 28G45 limit switch is failing?
Technicians should check for continuity across the terminals when the switch is cool. If the switch remains open at room temperature, the internal bimetal disc has likely failed, requiring a full replacement to restore furnace operation.
Can this switch be used in non-Lennox equipment?
While the Lennox 28G45 is a standard 140Ā°F limit, it is specifically designed for the airflow characteristics and mounting configurations of Lennox-built furnaces. Always verify the part number in the manufacturer's service manual to ensure correct fitment.
What causes this limit switch to trip repeatedly?
Frequent tripping is usually a symptom of restricted airflow, such as a dirty furnace filter, blocked return air vents, or a failing blower motor, rather than a defect in the switch itself.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
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Description
The Lennox 28G45 Limit Switch is a critical safety component designed for precise thermal regulation within residential and commercial Lennox HVAC systems. Engineered for automatic reset functionality, this high-limit control monitors plenum temperatures, interrupting the burner circuit if conditions exceed the preset safety threshold of 140Ā°F. This OEM Lennox furnace part features a versatile 60Ā°F to 140Ā°F operating range, ensuring stable performance during demanding heating cycles. Its durable ceramic and metal construction is built to withstand the high-heat environment of a heat exchanger while maintaining electrical continuity. For service technicians, identifying a failing 28G45 thermal switch often involves checking for frequent cycling or a furnace that stays in lockout mode. Replacing a worn Lennox high limit sensor with this genuine factory component ensures UL-certified protection and maintains the integrity of the furnaceās sequence of operations, preventing heat exchanger stress and potential safety hazards on the job site.
Key Technical Benefits
- Precise Thermal Calibration: Factory-set for 60-140Ā°F range to prevent overheating in Lennox G24 and G26 series units.
- Automatic Reset Logic: Eliminates the need for manual intervention once the temperature drops below the differential, reducing nuisance service calls.
- OEM Compatibility: Drops directly into standard Lennox limit switch mounting brackets for fast field installation.
- Robust Electrical Contacts: Designed to handle standard furnace control voltages without carbon tracking or premature failure.
Common Questions
How do I verify if the 28G45 limit switch is failing?
Technicians should check for continuity across the terminals when the switch is cool. If the switch remains open at room temperature, the internal bimetal disc has likely failed, requiring a full replacement to restore furnace operation.
Can this switch be used in non-Lennox equipment?
While the Lennox 28G45 is a standard 140Ā°F limit, it is specifically designed for the airflow characteristics and mounting configurations of Lennox-built furnaces. Always verify the part number in the manufacturer's service manual to ensure correct fitment.
What causes this limit switch to trip repeatedly?
Frequent tripping is usually a symptom of restricted airflow, such as a dirty furnace filter, blocked return air vents, or a failing blower motor, rather than a defect in the switch itself.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
